Grinding machine



Feb., 2, 1923..

l F. M.. Fue/ER. GRINDING MACHINE.

FILED FEB. I9, 1921.

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ttt lill ti renner-trennt. runnen, Ior nnvnnn, ims'sncnusnrrs, nssrenon 'ro nnirnn siren irnenrnnnv cearonnrron, or nanna-son, new .inns-inv, ii. conzeonarron or new Jansen.

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Application lerl February 19, 1921. Seria1`tTa4et6l13.

To all fui/somit may concern.'

lle it known that l. Fnnnnmon. lvl. FUI-umn, a. citizen ot the United States, residing' at Revere, in the county oit Suffolk and State ot li'lassachusetts, have invented. certain lin provcinents in Grindingl -Msuahines, oit

Ivvhich the following description, in connection with the accompanying drawings, is a spccicaticn, like `characters on the dran`- inns indicatinrry like parts in the several invention, relates to grinding machines and herein shown as embodied in a machine for lgrinding or sharpening; the teetl'i oit `rotary cutters such as are used, tor example, for trimming* the edges of boot and shoe soles.

Cutters usedfor thisand similar purposes f are `circula-r in peripheral outline` and include a plurality ot' evenly spaced teeth, the ends of which arefornied topresent cuttingedgesthat correspond to the desired traue` verse contour ot the edge ot theivorlr. and each tooth is backed otl't at a slight angle to the direction oit its motion in order to give the cutter the clearance necessary to enable the teeth to cut. It in sharpening1 these cul,-

ters,` `the faces` ot some` ot the teeth are pressed too firmly against the grinder, the teeth are apt to he burned or overggiound.

llencc the radial length of the teeth will be cuttersupport, a drivingmember, and driv ing; connections between the driving member `and the grinding Wheel, the effectiveness oi.

said connections being controlled by the pressure ot the cutter against the Wheel. ln the form of my invention selected 'for illustration, thedriving connections are trictional and normally maintained by springs which are arranged to yield when a predetermined pressure of the Work aga-inst the Wheel is exceeded.`

Although the invention has been. shoivn as embodied in a machine for grinding` the teeth of rotary cutters, it is Within the province of the invention to grind any object Where the grindingpressure should be limited to al predetermined amount. Furthermore, the invention is in no Way limited to the use of the radial face oft the `Wheel.

tor ,grinding the Work.

tace, Yis secured to one end of a drive shaft i rotatable and, under certain conditions, longitudinally movable inbearings 6 and S tor grinding, a bracket 14 isangularly and :longitudinally adjustable on a lug 12 pro- ,jectingr` forwardly from the traine.

The outer end of the bracket carries a cutter-supporting pla-te 16, which may be mounted ior sliding movement toward and from the grinding'iivheel in any usual Way, in order `that the `teeth may be presented to the Wheel successively for grinding. This support 41G may also be mounted for angular adjustment in order to vary the angle between the axis of the cuttter and the` plane of the cutting;r faces of the teeth. Projecting from the plate 16 is a stud 1S, which enters the axial bore in a cutter,'one of the teeth Q0 of which `is indicated in a ,grinding` position in Fig. l..

@rdinarily the operator presses the cutting face of a tooth to the grinding wheel,

using his judgment and skill as to the amount of pressure which should `be exerted. lt is ditlicult to present all the teeth of the grinder with the same pressure, and an unskilled operator is especially likely to press some of the teeth too hard or toolong against the Wheel. This is likely to burn or over grind the teeth` and consequently destroy their temper and vary theirlength. To prevent these undesirable results, the grinder :is mountedto yield andthen stop its rotation Whenever a` certain predetermined preseure is exceeded, `is shown, there is secured ,rising from` a" stand 10.` To support a cutter to the drive shaft bye set sc. en' :i sleeve ment ol the lrictional connectionsunder 24 lla-ving a` conical portion. 26, Surroun/.lpredetermined pressure ol the work against n.3 ing this portion of the shaft is n driving the grinding Wheel. pulley having; u mein portion 28 and e de- .ln n machine of the eluss described. in tacheble flange 30 secured by screivs to combination, n freine. a drife shaft mounted the main portion. Secured Within the pulto slide und rotate in the ilrnine. :in ubruf'linfr ley by the screws 32 is e plate or ring' 5t. Whed secured lo the drive shaft. u drivingi` ho lla-ving;r a. conical surface which is eompt'spulley, and driving connections between the mental to the conical surface 2G above men pulley und the sha'lt. seid connections liieingr io tioned. These surfaces' are normellji' mnindf pjupged by longitudinal movement ot tlnA tained in frictionsl engagement bi springs shaft/under inedetermined pressure oit' the 36 inserted in sockets in the pnllev. The Work against the wheel. 7:3, springs beer at one endagznnst sliding` pluri 4l. ln u grinding machine. in i onibinutuui.

i l0 surroundine` the sleeve 2l und contactingr rrlieel. :i pulley surroundinuthe. shu'tt. inter-- Withn shoulder on the sleeve. BIJ lions'. enzrfyin itrietiorml Surfaces on the slnilt the described parts Within the pulley. they und the pulley enclosed within the lutter. so ure protected from dust and Q-rit. :1nd con and :i spring` For nornnellv boldinir flic l'l'ir not be readily interferred with by un uniutional surfaces in engagement :ind yieldnble telligent operative to avoid proper frrind under predetermined pressure ol the nora In operation the operator turns the cull, ueuinst the Wheel.

by hand sind presents the teeth successively 5. ln n` grinding machine. in combination, S5

to the radial lince oli the grinder. ll the u {sgjrinding vrheel.Y .fi drive shaft. :i ineinbm' pressure exceeds :i certain undetermined .secured to tbe slisflt und huvingr :i conn-:il

amount which depends on tie tension of the portion. u driving' pulley bovine :1 wopernl v springs 36, the shu'tt 4; will l1ne moved leunt ingr conical portion und springs For holding;

tudinztlly, andv the conieul `surrrrce 26. will the conicnl portionsl in trietionnl enozigre- 90 vslip rela-tively to the corresponding surface nient but ndfipted to yield when their 1enof the ring' '34. This slows down or stops sion is exceeded by the pressure o the work the grinding ivlieel which remains :it rest against the wheel.

,fiers 38, ivhich in turn beur against n lo; u grinding Wheel. 1 shutt secured to the 21s long` as an excessive pressure is inuin- 6. l'n `lgrindingmachine. in combinution. tame e frame? :t orive shatt mounted to slid. und 95 lVhenever it is desired to grind cutters rotate in the treme. n driven nheel havingy havingrteeth the cutting` surfaces et which e radial ubrndine; fece. :i driving member.

are smaller in aree, it may be desirable to und yielding; connections between the drivlessen the pressurevivhicli may be exerted inn' member'und the drive .shaft :idepied to .against the grinder. In the torno shown become inoperative noon longitudinnl znoveloo vin Fig. 2, there't'ormthe pulley is provided nient oli the. shnt't under predetermined presH with a threaded extension 42 sind with spersure ol the ivorl; against the ubrndine' luf'e le tures in which sli-de plume-ers elflwhich beer of the wheel. I l

against the springs 36. rlhese plungers .4f/l 7. ln machine ot the class described. in may be adjusted simultsneouslylo very the combination, ar tranne. n drivey sluiit mounted 105 (tension of the springs by means oi u, nut to slide und rotute inthe 'l'runuu :in :ibrndingr 46 threaded en the extension 42. whe-el secure l to the sini. it. :1 d rivinp; pulley.

` Having described my invention. what I intere/needing); YFrietionel surfaces on the clnim es new and desire to secure bv Letters shaft and the puller. nud ineens lor con stent of the United States is: steutly urgriim` the drive rabatt loinriludinully l l0 l. In a cutter' grinding machine1 in eomto maintenir -lrietionnl eiuninement. seid binstion. e grinding Wheel, a` cutter support. menus being; yielded-le under ii-edelrrinined '5G la 'flrill' member, driving; connections bepressure ot the work against the wheel to distween the driving member und the .Q'rindengage the lrictionnl surfaces.

lng Wheel Sind-ineens normally muintuining 8. ln e machine et the class described` in 115 the effectiveness oli seid connections and combination. n, grinding wheel. :i drive slm-ft (Lrrenged to yield underpredetermined prestherefor.` driving1 member. rictionul von sure of the cutter against the Wheel to rennections/ bem'een the driviingj member und der seid connections ineffective to drive the drive sli-ult. resilient menus Afor north@ .Whel i l molly nuiintnining suid 'Frietionul eonnec- T20 2- n egrinding machine, in combination. tions. and means for varying the tension ol' il gllflngwheel, e. drive shaft therefor7 n. seid resilient means.

oo driving pulley surrounding the shaft, liricln testimony whereof l here sinned my tional connections between the driving nume to this specification. pulley and the drive shaft, and means con struotedanderrenged to permit disengsge- FREDERICK M FURBER.. 

